15 PIN UNKNOWN CONNECTOR
| Pin | Name | Description | 
|---|---|---|
| 1 | TEXT | Video text signal from TMG; set to inverse of GR, except in double high-resolution mode. | 
| 2 | 14M | 14M master timing signal from the system oscillator. | 
| 3 | SYNC* | Displays horizontal and vertical synchronization signal from IOU pin 39. | 
| 4 | SEGB | Displays vertical counter bit from IOU pin 4; in text mode, indicates second low-order vertical counter; in graphics mode, indicates low-resolution. | 
| 5 | 1VSOUND | One-volt sound signal from pin 5 of the audio hybrid circuit (AUD). | 
| 6 | LDPS* | Video shift-register load enable from pin 12 of TMG. | 
| 7 | WNDW* | Active area display blanking; includes both horizontal and vertical blanking. | 
| 8 | +12V | Regulated +12 volts DC; can drive 300mA. | 
| 9 | PRAS* | RAM row-address strobe from TMG pin 19. | 
| 10 | GR | Graphics mode enable from IOU pin 2. | 
| 11 | SEROUT* | Serialized character generator output from pin 1 of the 74LS166 shift register. | 
| 12 | NTSC | Composite NTSC video signal from VID hybrid chip. | 
| 13 | GND | Ground reference and supply. | 
| 14 | VIDD7 | From 74LS374 video latch; causes half-dot shift high. | 
| 15 | CREF | Color reference signal from TMG pin 3; 3.58 MHz. | 
  Note:
  The signals at the DB-15 on the Apple IIc are not the same as
  those at the DB-15 end of the Apple III, Apple IIGS, and Macintosh II.
  Do not attempt to plug a cable intended for one into the other.
  Note:
  Several of these signals, such as the 14 MHz, must be buffered
  within about 4 inches of the back panel connector--preferably inside a
  container directly connected to the back panel.
| Contributor: | Joakim Ögren | 
| Source: | Apple Tech Info Library 1419: Apple IIc, External Pinouts at Apple TIL homepage | 
  Copyright © The Hardware Book Team 1996-2004.
  May be copied and redistributed, partially or in whole, as appropriate.
  Document last modified: 2002-01-10